US Bridges

Road 48 over Glenn-Colusa Canal

Fair

Glenn County, California · 1.0 MI E of RD 99W · Structure no. 11C0222

Built
1948
77 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
153 ft
5 main spans
Daily traffic
150
2011 count
Owner
County
County Highway Agency

About this bridge

Road 48 over Glenn-Colusa Canal is a concrete continuous slab carrying Road 48 over Glenn-Colusa Canal in Glenn County, California. It was built in 1948, so it is 77 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 150 vehicles a day, roughly 30% of them trucks, projected to reach 189 by 2043. The structure is 153 ft (46.6 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesRoad 48
CrossesGlenn-Colusa Canal
Location1.0 MI E of RD 99W
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.53884, -122.17399
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating37.5 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length153 ft (46.6 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2011)
Projected traffic189 by 2043
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 48 over Glenn-Colusa Canal built?

It was built in 1948, making it 77 years old in 2025.

What condition is Road 48 over Glenn-Colusa Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does Road 48 over Glenn-Colusa Canal carry?

About 150 vehicles per day (2011 count), of which roughly 30% are trucks.

How long is Road 48 over Glenn-Colusa Canal?

The structure is 153 ft (46.6 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns Road 48 over Glenn-Colusa Canal?

It is owned by the County Highway Agency.